// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

package jodd.servlet;

import javax.servlet.ServletRequestListener;
import javax.servlet.ServletRequestEvent;
import javax.servlet.http.HttpServletRequest;

/**
 * Bounds request to the current thread (and all children threads).
 */
public class RequestContextListener implements ServletRequestListener {

	private static final ThreadLocal<HttpServletRequest> requestHolder = new InheritableThreadLocal<>();

	public void requestInitialized(ServletRequestEvent requestEvent) {
		HttpServletRequest request = (HttpServletRequest) requestEvent.getServletRequest();
		requestHolder.set(request);
	}

	public void requestDestroyed(ServletRequestEvent servletRequestEvent) {
		requestHolder.remove();
	}

	/**
	 * Returns current HTTP servlet request. May return <code>null</code>
	 * is request was not bound to the thread.
	 */
	public static HttpServletRequest getRequest() {
		return requestHolder.get();
	}

}